Lake volume and groundwater storage variations in Tibetan Plateau's endorheic basin

Lake volume and groundwater storage variations in Tibetan Plateau's endorheic basin
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青藏高原内陆盆地湖泊水量与地下水储量变化

DOI:
10.1002/2017gl073773
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发表时间:
2017-06-16
影响因子:
5.2
通讯作者:
Yu, Jinyuan
Yu, Jinyuan
中科院分区:
地球科学1区
文献类型:
--
作者:
Zhang, Guoqing;Yao, Tandong;Yu, Jinyuan

文献摘要

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青藏高原是世界上海拔最高、面积最大的高原,具有复杂的冰圈水文地球动力学过程,对人类活动造成的气候变暖尤为敏感。TP中的定量水质量预算知之甚少。在这里,我们研究了1970年代至2015年期间湖泊面积,水位和体积的年度变化。我们发现,在1970年代至2015年期间,湖泊体积变化的模式很复杂:在1970年代至1995年期间略有减少-2.78Gtyr(-1),随后在1996年至2010年期间迅速增加12.53Gtyr(-1),然后在2011年至2015年期间最近减速(1.46Gtyr(-1))。然后,我们估计了最近的水质量预算的内部TP,2003-2009年,包括陆地储水量,湖泊体积,冰川质量,雪水当量(SWE),土壤水分和永久冻土的变化。水质量收支的主要组成部分,即湖泊体积(7.720.63Gtyr(-1))和地下水储量(5.011.59Gtyr(-1))的变化,以相似的速度增加。我们发现,净降水量增加贡献了大部分的水供应(74%)的湖泊体积的增加,其次是冰川质量损失(13%),和地面冰融化由于冻土退化(12%)。其他术语,如SWE(1%),贡献相对较小。这些结果表明,在TP的水文循环显着加强,在最近几十年。
The Tibetan Plateau (TP), the highest and largest plateau in the world, with complex and competing cryospheric-hydrologic-geodynamic processes, is particularly sensitive to anthropogenic warming. The quantitative water mass budget in the TP is poorly known. Here we examine annual changes in lake area, level, and volume during 1970s-2015. We find that a complex pattern of lake volume changes during 1970s-2015: a slight decrease of -2.78Gtyr(-1) during 1970s-1995, followed by a rapid increase of 12.53Gtyr(-1) during 1996-2010, and then a recent deceleration (1.46Gtyr(-1)) during 2011-2015. We then estimated the recent water mass budget for the Inner TP, 2003-2009, including changes in terrestrial water storage, lake volume, glacier mass, snow water equivalent (SWE), soil moisture, and permafrost. The dominant components of water mass budget, namely, changes in lake volume (7.720.63Gtyr(-1)) and groundwater storage (5.011.59Gtyr(-1)), increased at similar rates. We find that increased net precipitation contributes the majority of water supply (74%) for the lake volume increase, followed by glacier mass loss (13%), and ground ice melt due to permafrost degradation (12%). Other term such as SWE (1%) makes a relatively small contribution. These results suggest that the hydrologic cycle in the TP has intensified remarkably during recent decades.